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A study of a new hybrid vibration energy harvester based on broadband-multimode

  • Chen, Bing (School of Mechanical Engineering, University of Science and Technology Beijing) ;
  • Li, Shiqing (School of Mechanical Engineering, University of Science and Technology Beijing) ;
  • Tang, Xiaolei (School of Mechanical Engineering, University of Science and Technology Beijing) ;
  • Zhang, Lijie (China North Research Institute)
  • Received : 2019.12.28
  • Accepted : 2021.04.29
  • Published : 2021.07.25
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Abstract

To improve the energy conversion efficiency and working frequency bandwidth of a single frequency piezoelectric vibration energy harvester, a new type of hybrid vibration energy harvester is developed which is combined with the mechanism of piezoelectric and electromagnetic energy conversion. The system comprises of a PZT cantilever beam, an elastic suspended magnetic mass, a magnet block attached to the end of the cantilever beam and a resonator. The addition of resonator can not only increase the mode, but also adjust the frequency of harvester flexibly. Nonlinear magnetic force of magnet block not only broadens the frequency band and improves the output performance of the system, but also changes the resonant frequency to make the harvester have better adjustable performance. On this basis, an improved electromechanical coupled analytical model of continuum is proposed which can be solved by the Runge-Kutta algorithm and the influence of different factors (the mass and spring stiffness of the resonator, as well as the electromechanical coupling coefficient, electromagnetic coupling coefficient, magnet mass and magnetic flux) on the output are analyzed. According to the prototype of the vibration energy harvester developed, an experimental system was built. The performance of the independent and hybrid energy harvesters is evaluated by experimental and analytical methods. The peak output voltage of the piezoelectric part was about 4 times that of the electromagnetic part. The peak output current of the electromagnetic part is about 30 times that of the piezoelectric part. The study results show that the proposed new hybrid vibration energy harvester can achieve a wider frequency range and multimodal vibration energy harvesting. In addition, the bandwidth and power of the harvester can be dynamically adjusted by changing the resonator or electromechanical coupling coefficient, and the bandwidth of the harvester can also be adjusted by changing the quality and characteristics of the magnet.

Keywords

Acknowledgement

This work is supported by the Fundamental Research Funds for the Central Universities (FRF-GF-19-009B) and University of Science and Technology Beijing. Useful discussions with Professor Zhongjun Yin at the University of Science and Technology Beijing, is also gratefully acknowledged.

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